25 April 2007
Reason for treatment
Clean and remove tarnish
Tarnished. Very heavily tarnished inside around the rim. Cracks and other damages did not change since the last treatment report (see there).
Cleaned using Industrial methylated spirits (ethanol, methanol) applied on cotton wool swabs. Then further cleaned using Hotel silver dip (acidified thiourea), applied with a soft paint brush and immediately cleared with water. Rinsed thoroughly under flowing tap water, steam cleaned, dried with tissue paper and with hot air from a blower. Locally cleaned using Silvo silver and chrome (cotton wadding, white spirit, Newburgh chalk, china clay), applied with cotton wool swabs and cleared with White Spirit (composition variable - petroleum distillate). Degreased with Acetone (propan-1-one/dimethyl ketone) and renumbered with acrylic black.